 In the 10th century, the raven banner seems to have been adopted by Norse-Gaelic kings of Dublin and Northumbria.Many of the Norse-Gaelic dynasts in Britain and Ireland were of the Uí Ímair clan, which claimed descent from Ragnar Lodbrok through his son Ivar.A triangular banner appearing to depict a bird (possibly a raven) appears on a penny minted by Olaf Cuaran around 940.